Automatic damper



June 24, 1930. i

H, c. BAUMGARTEN v 1,767,869

AUTOMATIC DAME-ER Filed Oct. 29, 1928 //70 Ci/fiayg aj ATTORNEY;

Patented June 24, 1930 UNITED STATES PEATENTJQFFICE I nose 0. BAUMGARTEN, or nn'morr, mronroai'r, AssIeNon 'ro NEWCOMB-DAVID COMPANY, 1110., or nn'morr, :urcnrenn AUTOMATIC DAMPER Application filed October 29, 1928. Serial 1T0. 315,904

often fail to close them. I In a large plant, .15 such as the spraying department of an automobile factory, where a large number of spray booths and stacks are installed, the loss of heat by the causes described is con-. siderable.

The object of the present invention is to avoid this waste of heat by providing the stack with .an automatic damper which closes automatically when the blower is shut down. The blower is usually driven by a i motor, and the automatic device is preferably in the nature'of a solenoid controlledby the same switch that controls the current supply to the motor and having a core connected to the damper in such a manner as to operate. the same. In the preferred construction there is provided a spring which normally tends to close the damper, while the solenoid holds the damper open while energized during the running of the motor. Thus, when the switch is open to shut down the motor, the flow of current to the solenoid is also broken, and-the spring acts to close the damper automatically.

The invention is fully disclosed by way of example in the following description and in the accompanying drawing, in which- Figure l'is a side elevation of the apparatus; and

Figure 2 is a detail elevation of the solenoid and associated parts, taken at right angles to Figure 1 Reference to these views will now be .made by use of like characters which are employed to designate corresponding parts throughout.

20 of the motor.

The numeral'l designates the wall of a spray booth or other enclosure to be ventilated, and through this wall extendsia stack 2 which is directed upwardly to the atmosphere. The-wall is also traversed by a pipe 3 passing into the stack 2 and there provided with a nozzle & which points upward- 1y. The pipe 3 connects with a blower 5 driven by .a motor 6, during the running of which an upward draft is induced in the stack 2 to draw fumes and the like into the lower end thereof as indicated by the I arrows at the lower part of Figure 1.

Beneath the nozzle 4, a diametric shaft 7 is journalled in the stack and providedwith a damper or butterfly valve 8 adapted to close the stack. On the outside of the stack, the shafthas a finger 9 fixedthereto,'and this finger is joined by an expanded spring 10 to a fixed pin 11 on the stack.v This spring normally tends to compress and thereby bring the damper to closed position.

On the outer surface of the stack is pivotally mounted a solenoid 12on, a stud 13,. The solenoid contains the usual core 14 connected by a rigid rod 15 to an arm 16 also fixed on the exterior end of the shaft 7 When the solenoid isgenergized by the means presently to be described, the core 14 is drawn inwardly whereby the valve 8 is opened against the action of the spring 10 as illustrated in Figure 2.

Current is supplied to the motor and solenoid by a pair of conductors 17 connected to the terminals at one side of a switch ,18.

vFrom the other side of the switch, the conductors are continued at 19'to the terminals broken by a switch arm 21 adapted to be connected or disconnected at will at one side of the switch. The conductors 19' are This circuit is made or branched at 19 and connected to the terniinals ofthe solenoid 12 through a bushing in both views.

22 as clearly shown that the solenoid is en- It will be obvious ergized only while the-motor is running and when the motor is disconis de-energized the running of the motor nected. During the solenoid holds the valve 8 open against v the action of the spring 10 as already indisald -cated, but when-the apparatus is shut down,

de-energized, and the the solenoid becomes to close the'valve, so

spring 10 functions a that no heat from the interior of the building is lost to the atmosphere.

Although a specific embodiment of the invention has been illustrated and described, it will be understood that various alterations in the details ofconstruction may be made without departing from the scope of the invention asingdicated"by the appended claims.

What I claim is 1. In a ventilating device including a stack, -a nozzle extending-thereinto, a blower for forcingair through said nozzle, and a motor for drivingqwaid blower, said blower and motor being exterior of said stack, the combination of adamper in said stack, and electrical means for actuating said damper, means and inotor having a common source of current supply, whereby the position of the damper .1s determined by the operation of the motor.

2. In a ventilating device including a stack, a nozzle *extending-thereinto, a'blower for forcing 'air-ithrough said nozzle and a motor for driving said blower, said blower and motor. being exterior ofsaid stack, the combination of a. damper in said stack, asolenoidand corev connected to said damper and adapted to 'open'the same when energized, said solenoid and motor having a common sourceoi-current supply, whereby the position of the damper is determined by the operation. of the motor.

-3. In a ventilating device including a I stack, a nozzle extendingthereinto, a blower A and electrical for forcing air through said nozzle and a motor for driving lsaid blower, said blower andmotor being exterior of said stack, the combination of solenoid and core connected .to said damper and adapted to open the same when energized, said solenoid and motor having a common source of current supply, whereby the position of the damper is determined by the operation of the motor, and a spring normally tending to close said damper.

4., In a ventilating device including a stack, a nozzle extending thereinto, a blower for forcing air through said nozzle and a motor for driving said blower, said blower and motor being exterior of said stack, the combination of a damper in said stack, means normally tending to close said damper means adapted to open said' damper, said means and motor having a common source of current supply, whereby the position of the damper is determined by the operation of the motor.

In testimony whereof I aflix my signature.

HUGO o. BAUMGARTEN.

'a'damper in said stack, a a 

